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Core Laboratories Inc. provides reservoir description and production enhancement services and products to the oil and gas industry in the United States, and internationally. It operates through Reservoir Description and Production Enhancement segments. The Reservoir Description segment includes the characterization of petroleum reservoir rock and reservoir fluid samples to enhance production and improve recovery of crude oil and gas from its clients' reservoirs. It offers laboratory-based analytical and field services to characterize properties of crude oil and oil delivered products; and proprietary and joint industry studies, as well as services that support carbon capture, utilization and storage, geothermal projects, and the evaluation and appraisal of mining activities. The Production Enhancement segment provides services and products relating to reservoir well completions, perforations, stimulations, production, and well abandonment. It offers integrated diagnostic services to evaluate and monitor the effectiveness of well completions and to develop solutions to improve the effectiveness of enhanced oil recovery projects. The company markets and sells its products through a combination of sales representatives, technical seminars, trade shows, and print advertising, as well as through distributors. Core Laboratories Inc. was founded in 1936 and is based in Houston, Texas.

National Energy Services Reunited Corp. provides oilfield services to oil and gas companies in the Middle East, North Africa, and internationally. The company's Production Services segment offers hydraulic fracturing services; coiled tubing services, including nitrogen lifting, fishing, milling, clean-out, scale removal, and other well applications; stimulation and pumping services; primary and remedial cementing services; nitrogen services; filtration services, as well as frac tanks and pumping units; and pipeline and industrial services, such as water filling and hydro testing, nitrogen purging, and de-gassing and pressure testing, as well as cutting/welding and cooling down piping/vessels systems. This segment also provides production assurance chemicals; integrated project management projects; artificial lift services; and surface and subsurface safety systems, high-pressure packer systems, flow controls, service tools, expandable liner technology, vacuum insulated tubing technology for steam applications, and engineering capabilities with manufacturing capacity and testing facilities, as well as sources and treats water for oil and gas, municipal, and industrial use. Its Drilling and Evaluation Services segment offers drilling and workover rigs; rigs and integrated services; fishing and remediation solutions; directional and turbines drilling; drilling fluid systems and related technologies; wireline logging; slickline services for removal of scale, wax and sand build-up, setting plugs, changing out gas lift valves, and fishing and other well applications; and well testing services to measure solids, gas, and oil and water produced from well, as well as rents drilling tools. This segment also provides oilfield solutions for thru-tubing intervention; tubular running services; and a range of wellhead products, flow control equipment, and frac equipment. National Energy Services Reunited Corp. was incorporated in 2017 and is headquartered in Houston, Texas.

ProPetro Holding Corp. operates as an integrated oilfield services company. The company provides hydraulic fracturing, wireline, cementing, and other complementary oilfield completion services to upstream oil and gas companies in the Permian Basin. ProPetro Holding Corp. was founded in 2007 and is headquartered in Midland, Texas.

Select Water Solutions, Inc., together with its subsidiaries, provides water management and chemical solutions to the energy industry in the United States. The company operates through three segments: Water Services, Water Infrastructure, and Chemical Technologies. The Water Services segment provides water-related services, including water sourcing, water transfer, flowback and well testing, water containment, fluids hauling, water monitoring, and water network automation; technology solutions comprising hydrographic mapping, water volume and quality monitoring, remote pit and tank monitoring, leak detection, asset and fuel tracking, and automated-equipment services, as well as various surface rental equipment and workforce accommodation services. The Water Infrastructure segment engages in the recycling, gathering, transferring, and disposal of water through a network of permanent pipeline infrastructure, semi-permanent pipeline infrastructure, water recycling facilities, earthen pits, water sources, and SWDs; provides solids management services; and develops, builds, and operates semi-permanent and permanent infrastructure solutions. The Chemical Technologies segment provides technical solutions, products, and services related to chemical applications in the oil and gas industry. This segment develops, manufactures, and manages logistics; and provides chemicals used in hydraulic fracturing, stimulation, cementing, and well completions for pressure pumpers and oil and gas producers, as well as offers production chemical solutions for underperforming wells, corrosion and scale monitoring, chemical inventory management, well failure analysis, and lab services. It primarily serves oil and gas producers. The company was formerly known as Select Energy Services, Inc. and changed its name to Select Water Solutions, Inc. in May 2023. Select Water Solutions, Inc. was incorporated in 2016 and is headquartered in Houston, Texas.